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Author Topic: Bi Colour Led Matrix Problem  (Read 1361 times)
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I suggest you probe the part as suggested in #6 then and determine the pin order.
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Any suggestions regarding the lone green lights?
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Any suggestions regarding the lone green lights?
Unless you can find out exactly what you have we can't tell you exactly what to do. You have to do your part and help us help you.
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You're going to have 8 red anode and 8 green anodes, and 8 common cathodes,
or,
8 red cathodes & 8 green cathodes, and 8 common anodes. You have to do some experimenting to determine what is where.
It is not hard.
Take 5V thru a resistor and a ground wire.
Touch them to two pins. Say pin 22 is Gnd to start - now touch the resistor to the other pins & see what lights up.
If you find a bunch, them you have a common cathode array (the rows in the picture below). Make a note of the low and which pins turn on for the anodes (the columns).
The pins that didn't have a light are likely other common cathodes. Move the Gnd to one of those, and what lights up.

If you don't find a bunch to start, switch the Gnd & resistor around, maybe you have a common anode part instead.
Be methodical,  it is not hard to figure out.

typical common cathode part


typical common anode part

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Designing & building electrical circuits for over 25 years. Check out the ATMega1284P based Bobuino and other '328P & '1284P creations & offerings at  www.crossroadsfencing.com/BobuinoRev17.
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Common +, green is + and red is + and gnd is gnd, so common anode.
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sorry to switch colours is  + so I guess is cathode, or maybe your diagrams are mixed up... smiley-sad)
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Now half of it isnt working and it is green and yellow and orange, could the leds be burnt from 5v?
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Never mind now it all works but one side is green other is red>  smiley-mad
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Ok now I got the program running it is random, and at the "SPACE" at the end it is supposed to be clear but there is two lines left.  smiley-confuse smiley-slim
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